Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d3647ee300b5e06…

MALICIOUS

PDF

78.2 KB Created: 2021-03-21 06:45:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 166e7a3ad6c61f9378d5eabd6b371d4e SHA-1: 8b8214b3e14e17916f1c1d7b695eb6e696b7f963 SHA-256: 8d3647ee300b5e0637605813282e0a11bd33c957c2dac3574ef077a66178e759
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://mezovuduw.ru/123?utm_term=garena+rov+thailand++ios PDF link annotation
    • https://cdn.sqhk.co/jebavimot/je9Digb/rezevegidarewijafaka.pdfIn PDF document text
    • http://7gusevshop.website/age_of_sigmar_realms_of_battle_rulesh3f25.pdfIn PDF document text
    • https://cdn.sqhk.co/zokasejiz/idoYnji/semesufibopufumabupos.pdfIn PDF document text
    • https://cdn.sqhk.co/rovifatira/jjVMhgl/adobe_photoshop_free_windows_10_pro.pdfIn PDF document text
    • https://cdn.sqhk.co/vinogusi/ciihbgg/coin_master_free_cards_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/nifodotiriru/dGmUkoS/fundamental_principles_of_metaphysics_of_morals.pdfIn PDF document text
    • http://pezuzumosuxuku.22web.org/gelovumogufi.pdfIn PDF document text
    • https://cdn.sqhk.co/bogulevim/1lw4Eif/41694474590.pdfIn PDF document text
    • http://com-signto6.xyz/diary_of_a_street_diva_free_downloadg7b19.pdfIn PDF document text
    • http://psylath.com/395759178293z4kr.pdfIn PDF document text
    • http://gifudevuf.iblogger.org/apics_certification_study_guide.pdfIn PDF document text
    • http://hisgohar.site/whirlpool_washing_machine_resettd89f.pdfIn PDF document text
    • http://shoppingyxplus.xyz/moneygram_customer_service_number_united_statesrqyi8.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rejizupufuxetib.rf.gd/brief_history_of_ottoman_empire.pdfIn PDF document text
    • http://fapabuzoliwesaz.epizy.com/61810849288.pdfIn PDF document text
    • https://ad323f3e-245e-4e3c-8b16-de91fefec063.filesusr.com/ugd/5ea691_6bc294d2bfcc45fd91e4da1872863c7c.pdf?index=trueIn PDF document text
    • http://miwufojo.epizy.com/corporate_brand_identity_guidelines.pdfIn PDF document text
    • http://resutujimi.epizy.com/vojubajikatuvivulureti.pdfIn PDF document text
    • http://jakiwokokik.epizy.com/saforeropimegij.pdfIn PDF document text
    • https://eb72eaa1-ef55-40a3-a653-f6d21bccf295.filesusr.com/ugd/54913d_5ddeff6199ae44f2a641c1773849fe9c.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000e72f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE72F 12032 bytes
SHA-256: 933ace3a054efb647415f04c9877cf51e026b101c86b25e049f314372cabd32c
font_00_sfnt_off0000d638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD638 5004 bytes
SHA-256: 6918b1d643631ef8fe3e12cdd4b47878d7c7c67c52cd22b29502793c457799e7
font_02_sfnt_off00010813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10813 10344 bytes
SHA-256: f594ef652b21be53320c4f2f80f7ab75f06cde4fd3376ef3a406d4d8b9d8af48